Chapter 1: Overview 1-9
Heading and Position
Data
Heading and Position
Data
Heading and Position Data
Full functionality of the radar/chartplotter is achieved when it is part of an
integratedsystem with otherequipment (in addition to another
hsb
2
unit)
connectedvia SeaTalkor NMEA 0183. Data from this equipment including
positionand headingis shown on the display and is used in calculations.
Detailson connectingother equipment are given in Chapter 8.
Providing Heading Data forMARPA
The performanceof MARPA is dependent on the quality of your heading
sensor. It is importantthat both the heading sensorand the radar scanner
(bearingalignment) are correctlycalibrated.Referto the appropriate heading
sensor and radar scannerhandbooksfor calibration details. The betterthe
accuracyof your heading data, the betterthe performance of MARPA.
Agyrocompassprovidesthebestperformanceinallconditions.Alternatively
you could use a fluxgate compass with rate gyro stabilization.
MARPA requires heading data to be frequently updated (we recommend a
dataoutputrateof greaterthan8 Hz);headingdatamustthereforebeprovided
to the display on NMEA.
In multiple-display systems, heading must be connected,via NMEA, to each
displaythat will be used for MARPA.
We recommend the Pathfinder Smart Heading System (which includesthe
Gyro Plus 2 unit). Good results are also obtained with a Raymarine autopilot
system incorporating a 150G or 400G Course Computer with internalrate
gyro.
Other heading sensorsconnected on NMEA may provide satisfactory results
inreasonablesea states.However,in unsettledconditionsa rategyrocompass
is advisable.
Contact Raymarine Customer Servicesor your authorized Raymarine dealer
for additional information. For specificconfiguration details with the
Raymarinecourse computer referto Appendix E.If you areusing a suitable
third party heading sensor, refer to its documentation for installation and
calibration details.
81186_3.book Page 9 Thursday, August 22, 2002 8:23 AM
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